Cannot apply indexing with [] to an expression of type 'system.collections.generic.ienumerable<>

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i was trying to add a data column to a data table from a text file but i am getting an error like this .I have tried to convert to list also but still is not working

What I have tried:

var contents = File.ReadAllText(filename).Split('\n');    
var csv = from line in contents    
          select line.Split(':').ToArray();    
    
 DataColumn Col=dt.Columns.Add("Name", typeof(String));  
  Col.SetOrdinal(0); // set column to first position  
int i=0;    
foreach(DataRow row in dt.Rows)    
{    
    //need to set value to NewColumn column    
    row["Name"] = csv[i];   // here is the issue.Tolist also not working
  i++;    
}

Posted 8-Dec-21 21:40pm

Manidas Payyoli

Updated 17-Dec-21 6:36am

Sean Ewington

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Richard Deeming 9-Dec-21 4:39am

REPOST
You have already posted this - TWICE:
How to add a text file into dtatatable column as first column[^]
How to add a data column to existing data table[^]

1 solution

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OriginalGriff · Answer 1 · 2021-12-08T22:04:00

Solution 1

The problem is that csv isn't an array - if you hover the mouse over it, its an IEnumerable<string[]> - an enumerable collection of arrays of strings.
You can convert that to an array of array of strings by adding brackets:

C#

var csv = (from line in contents
           select line.Split(':')).ToArray();

But that won't help you either: you are splitting a collection of items to create it, and that produces an array of strings - you need to decide which of those strings you are trying to use as the Name column data for your DataTable.

I'd start by looking at your file and thinking about what it contains: it probably isn't what you expect, especially given that "csv" normally stands for "comma delimited vales" and you are splitting on ":".

Sorry, but we can't do any of that for you: we have no idea what your file contains!

Posted 8-Dec-21 22:04pm

OriginalGriff

Comments

[no name] 9-Dec-21 4:15am

MY .txt FILE IS NOT COMMA SEPERATED FILE.JUST LINE BY LINE. LIKE,

NAME
val1
val3
val5

[no name] 9-Dec-21 4:16am

in my D drive i have this .txt file.This is what i need to add

[no name] 9-Dec-21 4:18am

not comma seperated just line by line

OriginalGriff 9-Dec-21 4:28am

So first off, change your variable name - if it isn't CSV data, your code should *not* imply it is!
Second, why are you splitting it at all, if it contains no colon characters? That does nothing useful, it just returns each line of the file as a separate array containing a single element!

You need to think about your data, instead of assuming it's "such-and-such" - for example, you can't use a foreach easily, because the first line appears to be a header instead of a data row ...

And you don't need to read the file and split it on a newline anyway: File.ReadAllLines returns an array of all the lines in the file in one instruction ...

[no name] 9-Dec-21 4:43am

i tried that also but not working

[no name] 9-Dec-21 4:43am

string[] txt = File.ReadAllLines(pathC);

DataColumn Col = table.Columns.Add("Claim_ID", typeof(String));
Col.SetOrdinal(0); // set column to first position
int i = 0;
foreach (DataRow row in table.Rows)
{
//need to set value to NewColumn column
row["Claim_ID"] = txt[i];
i++;
}

OriginalGriff 9-Dec-21 4:58am

"It's not working" is one of the most useless problem descriptions we get: it tells us absolutely nothing about the problem. We don't know if you get an error message, or the wrong data, or even that that code compiles successfully!
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
So tell us what happens when you run that code, what you expected to happen, how you checked what happened. Help us to help you!